Photo by Melody

PlantFiles: Smooth Hydrangea, Wild Hydrangea, Sevenbark
Hydrangea arborescens 'Dardom'

Family: Hydrangeaceae (hy-drain-jee-AY-see-ee) (Info)
Genus: Hydrangea (hy-DRAIN-juh) (Info)
Species: arborescens (ar-bo-RES-senz) (Info)
Cultivar: Dardom
Additional cultivar information: (PP14168, aka White Dome)
Hybridized by Kromhout; Year of Registration or Introduction: 2002

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5 vendors have this plant for sale.

3 members have or want this plant for trade.


36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Sun to Partial Shade

Parts of plant are poisonous if ingested

Bloom Color:
White/Near White

Bloom Time:
Mid Summer


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:

Propagation Methods:
From softwood cuttings

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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No positives
1 neutral
1 negative

Gardeners' Notes:

Negative kellyspiegel On Sep 14, 2009, kellyspiegel from Indianapolis, IN (Zone 5b) wrote:

I have white dome in 2 areas of my yard. The "dome" has never turned white and remains green. The plants appear healthy and have remained at about 3 feet high. Have other growers had this issue? Maybe it should be marketed as "green dome."

Kelly Spiegel
zone 5, Indianapolis

Neutral lmelling On Dec 9, 2004, lmelling from Ithaca, NY (Zone 5b) wrote:

In "Hydrangeas for American Gardens," by Michael A. Dirr (2004), it says that 'Dardom' is advertised as a new introduction of the species type with largely off-white fertile flowers surrounded and occasionally interspersed with white sterile sepals in clusters of 3 (4). Inflorescences are larger than those of the typical species and carried on strong stems. The leaves are more robust, larger, and thicker.

Notes from Dirr book: The above characteristics are more of less accurate; however, the selection is not from H. arborescens but either subspecies 'discolor' or 'radiata'. The leaves are white beneath (should be green). From a standpoint of adaptability, it will lack heat tolerance, particularly in zones 7-9. Also, the flowers, as shown in advertisements, are similar to many subsp. radiata. Dirr gives specific Identification characteristics in his book, "Hydrangeas for American Gardens."


This plant has been said to grow in the following regions:

Orange Park, Florida
Indianapolis, Indiana
Sioux Center, Iowa
Spring Lake, Michigan

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